Updates read.me to include citation section

[SamFritz]

GitHub issue(s):

This PR addresses Issue-497: Update Read.me w/ citation information

What does this Pull Request do?

Adds in a section in the AUT read.me to identify how folks should cite AU tools. Implementation based on discussion in the ticket, specifically how how citation should be formatted.

Interested parties

@ianmilligan1 thanks for your final review; please feel free to adjust any of the wording!

[codecov]

Codecov Report

Merging #500 into main will not change coverage.
The diff coverage is n/a.

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  Coverage     88.85%   88.85%           
  Complexity       57       57           
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  Files            43       43           
  Lines          1014     1014           
  Branches         86       86           
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  Hits            901      901           
  Misses           74       74           
  Partials         39       39           

[ianmilligan1]

Looks good! I wonder if we should see what this looks like in a quote (i.e. put > in front of the citation line). Also might help to italicize the venue, i.e. _Proceedings of the ACM/IEEE Joint Conference on Digital Libraries in 2020 (JCDL '20)_.

[SamFritz]

checked indentation of citation (so it comes out more of like a block quote) looks good! and will update all citations so Proceedings portion is italicized. Thanks @ianmilligan1!

[ianmilligan1]

Great, looks good to me @SamFritz. I will let @ruebot do a final review + merge when he is available as I think of him as the keeper of all things AUT.